Genuine OEM Audi EGR Connecting Pipe, part number 03G131521AQ. This metal pipe is a key component of the exhaust gas recirculation (EGR) system, designed to connect various elements such as the EGR valve and cooler. It features a flexible section to absorb engine vibrations and thermal expansion, ensuring a durable and leak-free connection. Its primary function is to reroute a portion of exhaust gases back into the engine's intake, which helps to reduce harmful nitrogen oxide emissions. Using a genuine OEM pipe guarantees precise fitment and robust construction, essential for maintaining emissions compliance and system reliability.